Lecture Notes - Infratemporal Fossa & Oral Cavity

1. Muscles of mastication
   1. Masseter
   2. Temporalis
   3. Lateral pterygoid
   4. Medial pterygoid
2. Temporomandibular joint (TMJ)
   • Synovial, combined hinge and gliding joint, articular surfaces, articular disk
3. Infratemporal fossa
   • Boundaries
   • Content
     1. Lateral pterygoid muscle
     2. Maxillary artery
        • Course in infratemporal fossa (superficial or deep to lateral pterygoid muscle)
        • Main branches: middle meningeal, inferior alveolar, masseteric, deep temporal (ant. &post.), buccal and muscular branches to pterygoid muscles
        • The maxillary artery leaves the infratemporal fossa by entering the pterygopalatine fossa where it gives off its terminal branches ( infraorbital, sphenopalatine, descending palatine and pharyngeal)
     3. Mandibular division of the trigeminal nerve (V3), otic ganglion (PS)
        • Branches of motor division: (a) nerve to medial pterygoid muscle, (b) masseteric, (c) anterior and posterior deep temporal, (d) nerve to lateral pterygoid, (e) buccal (exception,this is a sensory nerve)
        • Branches of sensory division: (a) inferior alveolar, (b) lingual, auriculotemporal, (d) mylohyoid (exception, this is a motor nerve)
4. Submandibular triangle
   • Boundaries
   • Content: (1) submandibular gland (superficial part), (2) hypoglossal nerve, (3) facial artery, (4) facial vein, (5) submandibular lymph nodes, (6) mylohyoid nerve
5. Oral cavity
   • Upper and lower dental arches. Oral vestibule. Oral cavity proper
   • Dentition: temporary, permanent. Dental quadrants
   • Oral vestibule (buccal and labial): parotid duct opens
   • Oral cavity proper:
     • Submandibular ducts open
     • Multiple ducts of sublingual glands open
     • The tongue is its main occupant
6. Paralingual space:
   • Location, boundaries and content
7. Tongue: dorsum of tongue,
   • Extrinsic muscles (bilateral): genioglossus, hyoglossus, styloglossus.
   • Intrinsic muscles (bilateral): superior and inferior longitudinal, transversus, verticalis
   • Nerve supply